*{
    padding:0;
    margin:0;
    box-sizing: border-box;
}
.container{
    width:1130px;
    margin:auto;
}
/*导航样式*/
nav{
    background: #000;
}
nav ul::after{
    display: block;
    content: "";
    clear: both;
}
nav li{
    float: left;
    list-style: none;
}
nav a{
    color: #fff;
    text-decoration: none;
    padding:20px 18px;
    display: inline-block;
}
nav a:hover,
nav li.active a{
    background-color: #fff;
    color: #000;
}
/*banner样式*/
.banner{
    background: #2ba3d4;
    color: #fff;
    text-align:center;
    padding-top:130px;
    padding-bottom:130px;
}
.banner img{
    margin-bottom:40px;
}
.banner p{
    width:500px;
    margin:auto;
    margin-bottom:30px;
}
.banner a{
    background-color: #fff;
    color: #2ba3d4;
    text-decoration: none;
    padding:15px 30px;
    display:inline-block;
    border-radius: 4px;
    border:1px solid #fff;
}
.banner a:hover{
    background: #2ba3d4;
    color: #fff;
}
/*main样式*/
.main{
    background: #0ba1d8;
    color: #fff;
}
.main-t{
    text-align: center;
    padding:0 0 40px 0;
}
.main-t h2{
    margin-bottom: 10px;
}
.main-t p{
    width:600px;
    margin:auto;
    font-size:14px;
}
.row h3{
    margin-bottom: 10px;
}
.col-3{
    float: left;
    width:25%;
    padding-left: 15px;
    padding-right: 15px;
    margin-bottom: 30px;
}
/*become部分*/
.become,.main{
    padding:130px 0;
}
.become h2{
    text-align: center;
    margin-bottom: 60px;
    color: #000000;
}
.row{
    margin-left: 15px;
    margin-right:15px;
}
.row::after{
    display: block;
    content: "";
    clear: both;
}
.col-4{
    float: left;
    width:33.333333%;
    padding-left: 15px;
    padding-right: 15px;
    margin-bottom: 30px;
}
.become .item{
    text-align: center;
    border:1px solid #e5e5e5;
    padding:15px;
    border-bottom-color:#0ba1d8;
}
.become img{
    padding-top:50px;
    margin-bottom: 15px;
}
.become h3{
    margin-bottom:15px;
}
.become .item p{
    color: #444444;
    font-size:12px;
    margin-bottom:60px;
}
.footer{
    background: #000;
    padding:60px 0;
    color: #fff;
    text-align: center;
    font-size:14px;
}
@media (max-width:600px){
    .container{
        width:100%;
    }
    .banner p,.main p{
        width:100%;
    }
    .col-3,
    .col-4{
        width:100%;
    }
    .row{
        margin-left: 0;
        margin-right:0;
    }
}